DORMIA: a distributed system for mobile information access

To reverse engineer scenarios from event traces, one must infer causal relationships between events. The inferences are usually based on a trace with sequence numbers or timestamps corresponding to some kind of logical clock. In practice, there is an explosion of potentially causal relationships in the trace, which limits one's ability to extract scenarios. This work defines a more parsimonious form of causality called scenario causality that concentrates on certain major causal relationships and ignores more subtle, potentially causal links. The influence of an event is restricted to the particular scenario it is part of. An event which is not a message reception is defined to be caused by the previous event in the same software object, while a message reception is caused by a sending event in another object. The events are ordered to form a scenario event graph where typed nodes are events and the typed edges are certain causal relationships. Intuitively, we might say that most logical clocks, which identify events which "happened before" a given event and, thus, are potentially causal, give an upper bound on the set of causal events; scenario causality identifies a lower bound. The much smaller lower bound set makes it possible to reverse engineer and automate the analysis of scenarios.

Discusses key challenges in spoken document processing, mobile information access, and accessibility in a broader context.

The coexistence of different information systems that are unable to communicate is a persistent problem in healthcare and in integrated home care in particular. Physically federated integration is used for design of the underlying technical architecture to implement a mobile virtual health record for integrated home care. A user centered system development approach is followed during design and development of the system. A technical platform based on a service-oriented approach where database functionality and services are separated has been developed. This guarantees flexibility with regard to changed functional demands and allows third party systems to interact with the platform in a standardized way. A physically federated integration enables point-of-care documentation, integrated presentation of information from different feeder systems, and offline access to data on handheld devices. Feeder systems deliver information in XML-files that are mapped against an ideal XML schema, published as an interface for integration with the information broker, and inserted into the mediator database. A seamless flow of information between both different care professionals involved in integrated home care and patients and relatives is provided through mobile information access and interaction with different feeder systems using the virtual health record.

The Internet and developments in the mobile domain have fueled the first stage of what appears to be a paradigm shift of societal dimensions. Access technologies and standards are created almost daily, each taking a very specific view of user needs while generally disregarding the rest of the world. Radio spectrum may become, in a relatively short time, one of the most important economic commodities. Simple and fast access to this commodity will become a major issue. New service paradigms are bound to lead to cyclic infrastructure renewal, the investment volume of which cannot possibly support future widespread technical development and economic growth in this area. New technologies, enabling network evolution on the micro level and thus avoiding costly network infrastructure paradigm shifts, may be much better suited to adequately support the societal transition to the information age. In order to release the full economic potential of mobile communications, it is deemed worthwhile to research in depth possibilities, requirements, and performance of an open mobile access system, which is not yet another mobile access system but rather a fundamental set of scalable physical principles and parameters having the technical potential to satisfy any conceivable application in any conceivable radio environment, when combined with heterogeneous backbone networks and future enhanced versions of the Internet protocol. The authors have developed a coarse but integral view of a wireless access network which may satisfy the key requirements of a user- and business-centered radio access and service network.

The experimental study of electromagnetic interference of mobile phone radiations on brain waves is a contemporary research area and the ever-increasing use of mobile phones make it more imperative to explore the problem area in detail. Electromagnetic signal from mobile phones operating in Global System for Mobile (GSM) and wide band code division multiple access (WCDMA), has been considered in this paper and their interference impacts have been analyzed on the human electroencephalogram (EEG). The impact on brain waves i.e., delta, theta, alpha, beta and gamma waves are analyzed in five modes namely ideal mode i.e., when mobile phone is not in use, transmission mode and the receiving modes of second generation (2G) and third generation (3G) networks. The data has been acquired from 75 young and healthy students of a post graduate institute while the students were making their routine calls. The acquired EEG signal is analyzed using various parameters viz.; Approximate Entropy(ApEn), Largest Lyapunov Exponent (LLE), Hurst Exponent (HE), Correlation dimension (CD) and the power of the brain waves have also been analyzed. It has been found that due to mobile phone usage, there is variation in the nonlinear parameters and increase in the power of the alpha brain waves at T5O1 during 3GRx and decrease in alpha power at the P4O2 channel in all modes. It has been observed that the change at the right temporal region is more, the side to which mobile phone was held. The Statistical analysis has also been done using SPSS software which shows significant variations at some of the channels in different modes.

Studies have shown that for a datacenter DC power distribution system has higher efficiency and reliability than a traditional AC power distribution system. DC distribution system has two voltage standards, 48V and 380V. Most of the studies show that 380V DC distribution is more promising than the 48V DC distribution. This paper presents a quantitative comparison and evaluation for both the 48V DC and 380V DC distribution systems in terms of overall efficiency, system reliability, and overall cost. The 380V DC system has higher system efficiency and cost more, while the 48V DC system has higher system reliability. Based on this study, a new DC system architecture, which combines the advantages of both the systems, is introduced.

In future networks, mobile computers will become increasingly important. Distributed, mobile applications enable information access anywhere, anytime. Mobility, location independence and adequate information access will be supported simultaneously. Major problems due to mobility and the specific characteristics of portable computers and wireless communications are dynamic configuration, moving resources, reachability, data and functional consistency. In this paper we present a system called MOBI-DICK that addresses the problems of mobile computing. The requirements and solutions for service mobility are described in detail.

In mobile communication systems, users move with various speeds. Therefore, pilot designs using the fixed arrangement of pilot subcarriers and channel estimation method are not suitable. In this paper, we propose a group-based pilot design method in mobile orthogonal frequency division multiple access (OFDMA) systems. In the proposed method, we divide users into several groups based on the users' speeds and allocate an appropriate pilot arrangement for each group. Using the proposed method, we minimize the channel estimation errors of high-speed users while maximizing the resource efficiency of low-speed users.

Information access systems like social media and search engines are driving most of our interactions with information today. Personalization algorithms are playing a major role on what information we consume, thus, have a big impact on the society. It is important to understand how users of the web, are perceiving personalization processes. We run a survey study (N=61) with users of tech-related online communities to understand: i) how users are perceiving personalization in information access systems, especially when algorithms are guiding them into filter bubbles? ii) what is their view on the use of their personal data for personalization? iii) how it affects their trust to an information access system? and iv) whether the opacity of personalization algorithms affects their attitude towards personalization. Our results indicate the need for user-awareness of how personalization affects users’ interaction with information access systems.

Decentralized optimal scheduling for integrated community energy system via consensus-based alternating direction method of multipliers

The power generated by renewable energy sources (RES), including photovoltaic (PV) and wind energy systems, are a great deal dependent on climate situations that result in Power Quality (PQ) issues, which require rapid adjustment of energy transmission and distribution systems. As a solution, (Distribution Static Synchronous Compensator) DSTATCOM is implemented for reactive power compensation, reducing voltage sag, swell, and THD. A novel High-gain SEPIC-ZETA converter is designed in this study to enhance the voltage obtained from the PV system with high efficiency. On the other hand, the proposed work aims to improve PQ issues using DSTATCOM with PV-Wind and battery systems. Adaptive Neuro-Fuzzy Inference System (ANFIS) based Maximum Power Point (MPPT) controller is adopted for tracking optimal power from the PV and to tune the parameters of this controller adopting Whale optimization algorithm (WOA). Moreover, the PWM rectifier is employed to convert the AC supply from the wind energy system to DC and it is controlled by the Proportional Integral (PI) controller. Hysteresis Current Controller (HCC) is incorporated to generate reference current based on Synchronous Reference Frame (SRF) theory, which is required for the reduction of harmonics. Three phase voltage source inverter is integrated to convert DC-AC supply for distributing the energy supply to load application. Finally, the anticipated work is implemented in MATLAB/Simulink and the comparative analysis is made towards the conventional topologies to authenticate the proficiency of the developed work. As a consequence, the outcomes demonstrate the improved PQ with a lower THD value of 0.72% with high tracking efficiency is accomplished by the proposed technique.

It is our great pleasure to welcome you to ACM Hypertext 2011, the 22nd ACM Conference on Hypertext and Hypermedia, and to the "Land of the Innovator", the campus of the Eindhoven University of Technology, located in the "city of light" Eindhoven, the Netherlands. Hypertext is an exciting conference because it brings together researchers and practitioners with a wide range of technical and non-technical interests in the subject of hypertext, as illustrated by the four tracks we have in 2011: Dynamic and Computed Hypermedia, chaired by Peter Brusilovsky and David Millard; Emerging Structures and Ubiquitous Hypermedia, chaired by Niels Olof Bouvin and Frank Shipman; Social Media (Linking People and Things), chaired by Andreas Hotho, Gerd Stumme and Markus Strohmaier; Interaction, Narrative, and Storytelling, chaired by Mark Bernstein and Frank Nack. Three keynote speakers represent the breadth, depth and maturity of this conference: Marti Hearst, Wendy Hall and Noshir Contractor. Prof. Dr. Marti Hearst is professor at the University of California in Berkeley and performs research on improving (designing, developing and evaluating) systems for information access. Prof. Dr. Dame Wendy Hall, professor at the University of Southampton and former president of ACM, was one of the first computer scientists to study multimedia and hypermedia and has been at the forefront of the hypertext research community throughout her career. She is also one of the initiators of Web Science as a new research field. Prof. Dr. Noshir Contractor investigates factors that lead to the formation, maintenance and dissolution of dynamically linked social and knowledge networks. The Program Committee and the reviewers worked hard to select an excellent program from 104 paper submissions. We accepted 31 full papers and 4 short papers. Each paper was reviewed by three PC members. The program chair together with the track chairs Peter Brusilovsky, David Millard, Niels Olof Bouvin, Frank Shipman, Andreas Hotho, Gerd Stumme, Markus Strohmaier, Mark Bernstein and Frank Nack made a final selection based on the reviews and discussions within the PC. In addition to the paper selection we also managed to put an exciting program of workshops and tutorials together thanks to the effort of Martin Atzmüller and Mykola Pechenizkiy. Finally we put together an exciting set of demos and posters, thanks to Frank Allan Hansen and Natalia Stash. Before, during and after the conference the hypertext community has been kept up to date on all the initiatives and activities thanks to our webmaster Natalia Stash. The practical local arrangements are a team effort of locals from Eindhoven, coordinated by Riet van Buul. The program with (free) workshops and tutorials, three keynotes, social activities and generous student grants has been made possible through the sponsorship of ACM SIGWEB and the financial support of the Netherlands Organisation for Scientific Research (NWO), The Koninklijke Nederlandse Akademie van Wetenschappen (KNAW), The School for Information and Knowledge Systems (SIKS) and the Eindhoven University of Technology.

Because of the intermittence and randomness of renewable energy and the continuous variability of load. By configuring a certain capacity of energy storage in microgrid, the active and reactive power throughput can be flexibly and quickly adjusted to smooth load fluctuations and reliability of power supply improvement. It can improve the power quality and keep the system stable. Therefore, the application potential of distributed energy storage system in microgrid and distribution system is huge. In terms of give full play to the performance advantages of energy storage through distribution system, it is necessary to study the core technologies of modular integration, topology, capacity design and control of energy storage through distribution system. The feasibility and value of energy storage through distribution system in power system engineering are demonstrated. Based on the analysis of relevant requirements, a energy storage through distribution system based on micro energy storage unit is proposed in this paper. This structure is very suitable for energy storage components to be connected to the micro-grid to achieve plug and play, high efficiency, high reliability and high flexibility of energy storage system applications.

Our personal information, habits, likes and dislikes can be all deduced from our mobile devices. Safeguarding mobile privacy is therefore of great concern. Transparency and individual control are bedrock principles of privacy but making informed choices about which mobile apps to use has been shown to be difficult. In order to understand the dynamics of information collection in mobile apps and to demonstrate the value of transparent access to the details of mobile applications information access permissions, we have gathered information about 528,433 apps on Google Play, and analyzed the permissions requested by each app. We develop a quantitative measure of the risk posed by apps by devising a ‘sensitivity score’ to represent the number of occurrences of permissions that read personal information about users where network communication is possible. We found that 54% of apps do not access any personal data. The remaining 46% collect between 1 to 20 sensitive permissions and have the ability to transmit it outside the phone. The sensitivity of apps differs greatly between free and paid apps as well as between categories and content rating. Sensitive permissions are often mixed with a large amount of low-risk permissions and hence are difficult to identify. Easily available sensitivity scores could help users making more informed decision about choosing an app that could pose less risk in collecting personal information. Even though an app is “self-described” to be suitable for a certain subset of users (i.e children) it might contain content ratings and permission requests that are not appropriate or expected. Our experience in doing this research shows that it is difficult to obtain information about how personal data collected from apps is used or analyzed. In fact only 0.37% (1,991) of the collected apps show to have declared a “privacy policy”. Therefore, in order to make real control available to mobile users, apps distribution platforms should provide more detailed information about how their data if accessed is used. To achieve greater transparency and individual control, apps distribution platforms which do not currently make raw permission description accessible for analysis could change their design and operating policies to make this data available prior to installation.

The Mobile Organic Certification (MobiCert) project investigates the use of mobile technology for primary producers in organic certification in remote and rural Australia. The goals of the MobiCert project are to create a theoretical model for mobile device-based information access and provision and to develop and test a prototype mobile commerce interface for organic certification information access /provision in remote and rural areas. It is the pilot project in the SAmCom (Sustainable Agriculture m-Commerce) project framework, which aims to enhance the information access and provision for primary producers through m-Commerce. In this paper we present an overview of the organic certification world wide (especially in Australia) and the existing software solutions to aid primary producers; followed by the theoretical model for the MobiCert project, which will be validated during the next stage of the project.